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73mm, 89mm, 91mm, 114.3mm, 139.7mm nw hw casing pipe. description: 1. our nw hw pw casing tubes are of the highest quality ,are manufactured to exacting specifications using advancing maching technoogy. 2. they are manufactured from seamless steel tube by cold drawn.the material is xjy850/30crmnsia which meets the global standard. 3.

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Our company primarily engaged and export Down the hole hammer mining company. we depend on sturdy technical force and constantly create sophisticated technology to meet the demand of Down the hole hammer mining company customers. We're sincerely welcome close friends from different circles at dwelling and abroad come to cooperate!

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